A hydraulic control system for a low-density material transport semitrailer

Abstract

The invention discloses a hydraulic control system for a low-density material transport semitrailer, comprising a rear door switch oil cylinder for controlling the switch of the rear door of the low-density material transport semitrailer, a drum hydraulic motor for controlling the rotation of the unloading drum of the low-density material transport semitrailer, a winch hydraulic motor for controlling the return of the unloading push plate of the low-density material transport semitrailer, a hydraulic control integrated block for controlling the movement of the rear door switch oil cylinder, the drum hydraulic motor and the winch hydraulic motor, and a hydraulic oil pump and a hydraulic oil tank for providing power for the entire hydraulic control system. The advantages of the invention are: simple control, low cost, and good ability to overcome the problems of heating and system failure of the hydraulic system.

Description

Technical Field

[0001] The invention relates to the technical field of low-density material transport semi-trailers, in particular to a hydraulic control system for low-density material transport semi-trailers. Background Art

[0002] At present, the hydraulic control system used in domestic low-density material transport semi-trailers usually adopts a pressure reducing valve to achieve high and low pressure control, and uses an additional tensioning cylinder to ensure that the wire rope and conveyor belt are tight, but this structure has the following problems:

[0003] 1. The pressure reducing valve needs to reach the overflow pressure of the main overflow valve when working. The excess flow of the hydraulic system overflows back to the hydraulic oil tank at high pressure, causing the hydraulic system to heat up seriously;

[0004] 2. Adding a tensioning cylinder will increase the length of the wire rope, and at the same time, it will add a lot of guide pulley mechanisms, which will increase the failure rate of the system. Summary of the invention

[0005] In view of the problems in the background technology, the purpose of the present invention is to provide a novel hydraulic control system for a low-density material transport semitrailer.

[0006] To achieve the above object, the technical solution adopted by the present invention is:

[0007] A hydraulic control system for a low-density material transport semitrailer comprises a rear door switch cylinder for controlling the switch of a rear door of the low-density material transport semitrailer, a drum hydraulic motor for controlling the rotation of an unloading drum of the low-density material transport semitrailer, a winch hydraulic motor for controlling the return of an unloading push plate of the low-density material transport semitrailer, a hydraulic control integrated block for controlling the movement of the rear door switch cylinder, the drum hydraulic motor and the winch hydraulic motor, and a hydraulic oil pump and a hydraulic oil tank for providing power for the entire hydraulic control system; wherein the rear door switch cylinder, the drum hydraulic motor, the winch hydraulic motor, the hydraulic oil pump and the hydraulic oil tank are all connected to the hydraulic control integrated block, and the hydraulic oil pump is also respectively connected to the hydraulic oil tank and the engine power take-off of the low-density material transport semitrailer.

[0008] Further, the hydraulic control integrated block includes a main overflow valve and a main overflow valve solenoid reversing valve, a sub-overflow valve and a sub-overflow valve solenoid reversing valve, a rear door solenoid reversing valve, a discharge and return solenoid reversing valve, a one-way sequence valve, a two-way throttle valve, an inlet oil P, an oil return port T, a pressure measuring port P1, a rear door oil cylinder rod extension interface A1, a rear door oil cylinder rod retraction interface B1, a drum motor forward interface A2, a drum motor reverse interface B2, a winch motor forward interface A3 and a winch motor reverse interface B3;

[0009] The oil inlet is respectively connected to the pressure measuring port, the oil inlet of the main overflow valve, the oil inlet of the rear door electromagnetic reversing valve, the oil inlet of the discharge and return electromagnetic reversing valve, and the oil outlet of the hydraulic oil pump;

[0010] The oil return port is respectively connected to the oil outlet of the main overflow valve, the oil outlet of the main overflow valve solenoid reversing valve, the oil outlet of the sub-overflow valve, the oil return port of the rear door solenoid reversing valve, the oil return port of the discharge and return solenoid reversing valve and the winch motor reversing port B3;

[0011] The oil inlet of the main overflow valve solenoid reversing valve is connected to the oil outlet of the main overflow valve;

[0012] The oil inlet of the sub-relief valve is connected to the oil outlet of the sub-relief valve solenoid reversing valve, the oil inlet of the sub-relief valve solenoid reversing valve is connected to the hydraulic control oil port of the main relief valve, and the hydraulic control oil port of the main relief valve is also connected to the oil inlet of the main relief valve;

[0013] The oil outlet a and the oil outlet b of the rear door electromagnetic reversing valve are respectively connected to the two-way throttle valve, and the two-way throttle valve is respectively connected to the rear door oil cylinder rod extension interface and the rear door oil cylinder rod retraction interface, and the rear door oil cylinder rod extension interface and the rear door oil cylinder rod retraction interface are respectively connected to the rod extension interface a and the rod retraction interface b of the rear door switch oil cylinder;

[0014] The oil outlet a and the oil outlet b of the discharge and return electromagnetic reversing valve are respectively connected to the drum motor forward rotation interface A2 and the one-way sequence valve, and the one-way sequence valve is respectively connected to the drum motor reverse rotation interface B2 and the winch motor forward rotation interface A3;

[0015] The drum motor forward rotation interface A2 and the drum motor reverse rotation interface B2 are respectively connected to the drum hydraulic motor forward rotation interface a and reverse rotation interface b;

[0016] The winch motor forward rotation interface A3 and the winch motor reverse rotation interface B3 are respectively connected to the forward rotation interface a and the reverse rotation interface b of the winch hydraulic motor.

[0017] Furthermore, a pressure gauge is connected to the pressure measuring port P1.

[0018] Furthermore, a filter is connected between the hydraulic oil pump and the hydraulic oil tank.

[0019] Further, when the solenoid coil T0 of the main relief valve solenoid reversing valve and the solenoid coil TL of the sub-relief valve solenoid reversing valve are not energized, the inlet oil P and the oil return port T of the hydraulic control integrated block are connected.

[0020] Further, when the electromagnetic coil T0 of the electromagnetic reversing valve of the main overflow valve is energized and the electromagnetic coil TL of the electromagnetic reversing valve of the sub-overflow valve is not energized, the set pressure of the main overflow valve is 30 MPa.

[0021] Further, when the electromagnetic coil T0 of the main overflow valve electromagnetic reversing valve and the electromagnetic coil TL of the sub-overflow valve electromagnetic reversing valve are both energized, the set pressure of the main overflow valve is 16 MPa.

[0022] Compared with the prior art, the advantages of the present invention are:

[0023] 1. A two-way throttle valve is installed on the hydraulic branch of the rear door switch cylinder to control the flow of hydraulic oil into the rear door switch cylinder. A sub-relief valve and an electromagnetic reversing valve are designed on the main relief valve to control the excess flow of hydraulic oil in the system to overflow back to the hydraulic oil tank at low pressure to reduce the heating of the hydraulic system.

[0024] 2. By setting a one-way sequence valve on the hydraulic branch of the drum hydraulic motor and the capstan hydraulic motor, the dynamic balance control of the hydraulic system pressure is carried out to ensure that the capstan wire rope and the drum conveyor belt are taut, without adding additional guide pulleys, which effectively reduces the failure rate of the hydraulic control system. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the hydraulic control system of the low-density material transport semitrailer of the present invention;

[0026] Figure 2 It is a schematic diagram of the oil path of the hydraulic control system of the low-density material transport semitrailer of the present invention when the power take-off is hung;

[0027] Figure 3 It is a schematic diagram of the oil path of the hydraulic control system of the low-density material transport semitrailer of the present invention when the rear door is opened;

[0028] Figure 4 It is a schematic diagram of the oil path of the hydraulic control system of the low-density material transport semitrailer of the present invention when the rear door is closed;

[0029] Figure 5 It is a schematic diagram of the oil path of the hydraulic control system of the low-density material transport semitrailer of the present invention when unloading with a unloading push plate;

[0030] Figure 6 It is a schematic diagram of the oil path of the hydraulic control system of the low-density material transport semitrailer of the present invention when the unloading push plate returns to its original position;

[0031] Figure 7 This is a specific application embodiment of the hydraulic control system of a low-density material transport semitrailer of the present invention (the rear door is in a closed state);

[0032] Figure 8This is a specific application embodiment of the hydraulic control system for a low-density material transport semitrailer of the present invention (the rear door is in an open state);

[0033] Figures 2 to 6 In the figure, the dotted line indicates the direction of the hydraulic oil circuit;

[0034] Description of reference numerals:

[0035] 1. Rear door switch cylinder;

[0036] 2. Drum hydraulic motor;

[0037] 3. Winch hydraulic motor;

[0038] 4. Hydraulic control integrated block;

[0039] 4.1. Main relief valve;

[0040] 4.2. Main overflow valve solenoid reversing valve;

[0041] 4.3, secondary relief valve;

[0042] 4.4, overflow valve solenoid reversing valve;

[0043] 4.5, rear door solenoid reversing valve;

[0044] 4.6. Discharging and returning electromagnetic reversing valve;

[0045] 4.7, two-way throttle valve;

[0046] 4.8, one-way sequence valve;

[0047] 5. Hydraulic oil pump;

[0048] 6. Hydraulic oil tank;

[0049] 7. Power take-off;

[0050] 8. Filter;

[0051] 9. Pressure gauge;

[0052] 100. Backdoor;

[0053] 200, unloading roller;

[0054] 300, unloading push plate;

[0055] 400, hydraulic winch;

[0056] 500. Carriage. DETAILED DESCRIPTION

[0057] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the following further describes how the present invention is implemented in conjunction with the accompanying drawings and specific implementation methods.

[0058] See also Figure 1 As shown, the present invention provides a hydraulic control system for a low-density material transport semi-trailer, comprising a rear door switch cylinder 1 for controlling the opening and closing of a rear door 100 of the low-density material transport semi-trailer, a drum hydraulic motor 2 for controlling the rotation of an unloading drum 200 of the low-density material transport semi-trailer, a winch hydraulic motor 3 for controlling the return of an unloading push plate 300 of the low-density material transport semi-trailer, a hydraulic control integrated block 4 for controlling the actions of the rear door switch cylinder 1, the drum hydraulic motor 2 and the winch hydraulic motor 3, and a hydraulic oil pump 5 and a hydraulic oil tank 6 for providing power for the entire hydraulic control system; wherein the rear door switch cylinder 1, the drum hydraulic motor 2, the winch hydraulic motor 3, the hydraulic oil pump 5 and the hydraulic oil tank 6 are all connected to the hydraulic control integrated block 4, and the hydraulic oil pump 5 is also respectively connected to the hydraulic oil tank 6 and the engine power take-off 7 of the low-density material transport semi-trailer.

[0059] In the present invention, refer to Figures 1 to 6 As shown, the hydraulic control integrated block 4 comprises a main relief valve 4.1 and a main relief valve solenoid reversing valve 4.2, a sub-relief valve 4.3 and a sub-relief valve solenoid reversing valve 4.4, a rear door solenoid reversing valve 4.5, a discharge and return solenoid reversing valve 4.6, a one-way sequence valve 4.8, a two-way throttle valve 4.7, an inlet oil P, an oil return port T, a pressure measuring port P1, a rear door oil cylinder rod extension interface A1, a rear door oil cylinder rod retraction interface B1, a drum motor forward rotation interface A2, a drum motor reverse rotation interface B2, a winch motor forward rotation interface A3 and a winch motor reverse rotation interface B3;

[0060] The oil inlet P is respectively connected to the pressure measuring port P1, the oil inlet of the main relief valve 4.1, the oil inlet of the rear door electromagnetic reversing valve 4.5, the oil inlet of the discharge and return electromagnetic reversing valve 4.6 and the oil outlet of the hydraulic oil pump 5;

[0061] The oil return port T is respectively connected with the oil outlet of the main overflow valve 4.1, the oil outlet of the main overflow valve solenoid reversing valve 4.2, the oil outlet of the sub-overflow valve 4.3, the oil return port of the rear door solenoid reversing valve 4.5, the oil return port of the discharge and return solenoid reversing valve 4.6 and the winch motor reversing port B3;

[0062] The oil inlet of the main overflow valve solenoid reversing valve 4.2 is connected to the oil outlet of the main overflow valve 4.1;

[0063] The oil inlet of the sub-relief valve 4.3 is connected to the oil outlet of the sub-relief valve electromagnetic reversing valve 4.4;

[0064] The oil inlet of the sub-relief valve solenoid reversing valve 4.4 is connected to the hydraulic control oil port of the main relief valve 4.1;

[0065] The hydraulic control oil port of the main relief valve 4.1 is also connected to the oil inlet of the main relief valve 4.1;

[0066] The oil outlet a and the oil outlet b of the rear door electromagnetic reversing valve 4.5 are respectively connected to the two-way throttle valve 4.7, and the two-way throttle valve 4.7 is respectively connected to the rear door oil cylinder rod extension interface A1 and the rear door oil cylinder rod retraction interface B1, and the rear door oil cylinder rod extension interface A1 and the rear door oil cylinder rod retraction interface B1 are respectively connected to the rod extension interface a and the rod retraction interface b of the rear door switch oil cylinder 1;

[0067] The oil outlet a and the oil outlet b of the unloading and returning electromagnetic reversing valve 4.6 are respectively connected with the forward rotation interface A2 of the drum motor and the one-way sequence valve 4.8; the one-way sequence valve 4.8 is respectively connected with the reverse rotation interface B2 of the drum motor and the forward rotation interface A3 of the capstan motor; the forward rotation interface A2 of the drum motor and the reverse rotation interface B2 of the drum motor are respectively connected with the forward rotation interface a and the reverse rotation interface b of the drum hydraulic motor 2; the forward rotation interface A3 of the capstan motor and the reverse rotation interface B3 of the capstan motor are respectively connected with the forward rotation interface a and the reverse rotation interface b of the capstan hydraulic motor 3.

[0068] In the present invention, refer to Figures 1 to 6 As shown, a pressure gauge 9 is also connected to the pressure measuring port P1 for real-time monitoring of the oil pressure in the pipeline of the hydraulic system.

[0069] In the present invention, refer to Figures 1 to 6 As shown, a filter 8 is connected between the hydraulic oil pump 5 and the hydraulic oil tank 6 to filter out the residue in the hydraulic oil and prevent the residue from entering the hydraulic oil pump 5 and causing damage to the oil pump.

[0070] In the present invention, when the solenoid coil T0 of the main relief valve solenoid reversing valve 4.2 and the solenoid coil TL of the sub-relief valve solenoid reversing valve 4.4 are not energized, the inlet oil P of the hydraulic control integrated block 4 is connected to the return oil port T, see Figure 2 As shown, the control system is in a pressure-free state at this time.

[0071] In the present invention, when the electromagnetic coil T0 of the main overflow valve electromagnetic reversing valve 4.2 is energized and the electromagnetic coil TL of the sub-overflow valve electromagnetic reversing valve 4.4 is not energized, the set pressure of the main overflow valve 4.1 is 30MPa, which is the working state of the drum hydraulic motor 2.

[0072] In the present invention, when the electromagnetic coil T0 of the main overflow valve electromagnetic reversing valve 4.2 and the electromagnetic coil TL of the sub-overflow valve electromagnetic reversing valve 4.4 are both energized, the set pressure of the main overflow valve 4.1 is 16MPa, which is the working state of the winch hydraulic motor 3 or the rear door switch cylinder 1.

[0073] In the present invention, refer to Figure 3 As shown, when the solenoid coil T0 of the main overflow valve solenoid reversing valve 4.2, the solenoid coil TL of the sub-overflow valve solenoid reversing valve 4.4 and the cylinder rod extension solenoid coil T1 of the rear door solenoid reversing valve 4.5 are energized, the rear door is in the open working state. At this time, the hydraulic oil circuit in the hydraulic control system flows as follows:

[0074] The hydraulic oil in the hydraulic oil tank 6 first enters the hydraulic oil pump 5 through the filter 8, and then is pumped into the rear door electromagnetic reversing valve 4.5 through the hydraulic oil pump 5 through the oil inlet P of the hydraulic control integrated block 4, and then flows out from the oil outlet a of the rear door electromagnetic reversing valve 4.5, and flows into the rear door switch cylinder 1 through the two-way throttle valve 4.7 and the rear door cylinder rod extension interface A1 in sequence, so that the pressure of the cylinder rod extension chamber of the rear door switch cylinder 1 increases, thereby pushing the rear door switch cylinder 1. The cylinder rod extends outward and drives the rear door 100 to open upward. During the upward opening process of the rear door 100, the hydraulic oil in the cylinder rod retraction chamber of the rear door switch cylinder 1 will flow out from the rod retraction interface b under the push of the cylinder rod, and in turn flow into the rear door electromagnetic reversing valve 4.5 through the rear door cylinder rod retraction interface B1 and the two-way throttle valve 4.7, and finally flow back to the hydraulic oil tank 6 from the return oil port of the rear door electromagnetic reversing valve 4.5 through the return oil port T of the hydraulic control integrated block 4.

[0075] In the present invention, refer to Figure 4 As shown, when the solenoid coil T0 of the main overflow valve solenoid reversing valve 4.2, the solenoid coil TL of the sub-overflow valve solenoid reversing valve 4.4 and the cylinder rod retraction solenoid coil T2 of the rear door solenoid reversing valve 4.5 are energized, the rear door is in the closed working state. At this time, the hydraulic oil circuit in the hydraulic control system flows as follows:

[0076] The hydraulic oil in the hydraulic oil tank 6 will first enter the hydraulic oil pump 5 through the filter 8, and then be pumped into the rear door electromagnetic reversing valve 4.5 through the hydraulic oil pump 5 through the oil inlet P of the hydraulic control integrated block 4, and then flow out from the oil outlet b of the rear door electromagnetic reversing valve 4.5, and flow into the rear door switch cylinder 1 through the two-way throttle valve 4.7 and the rear door cylinder rod retraction interface B1, so that the cylinder rod retraction chamber pressure of the rear door switch cylinder 1 increases, thereby driving the oil of the rear door switch cylinder 1. The cylinder rod retracts inwards and drives the rear door 100 to close downwards. During the process of the rear door 100 closing downwards, the hydraulic oil in the cylinder rod extension chamber of the rear door switch cylinder 1 will flow out from the rod extension interface a under the push of the cylinder rod, and in turn flow into the rear door electromagnetic reversing valve 4.5 through the rear door cylinder rod extension interface A1 and the two-way throttle valve 4.7, and finally flow back to the hydraulic oil tank 6 from the return oil port of the rear door electromagnetic reversing valve 4.5 through the return oil port T of the hydraulic control integrated block 4.

[0077] In the present invention, refer to Figure 5As shown, when the electromagnetic coil T0 of the main overflow valve electromagnetic reversing valve 4.2 and the electromagnetic coil T3 of the discharge and return electromagnetic reversing valve 4.6 are energized, it is the discharge working state. At this time, the hydraulic oil circuit in the hydraulic control system flows as follows:

[0078] The hydraulic oil in the hydraulic oil tank 6 will first enter the hydraulic oil pump 5 through the filter 8, and then be pumped into the unloading and return electromagnetic reversing valve 4.6 through the hydraulic oil pump 5 through the oil inlet P of the hydraulic control integrated block 4, and then flow from the oil outlet a of the unloading and return electromagnetic reversing valve 4.6 through the drum motor forward rotation interface A2 to the drum hydraulic motor 2. At this time, the drum hydraulic motor 2 will rotate forward under the pressure of the hydraulic oil to perform the unloading operation (that is, the drum hydraulic motor 2 will drive the unloading drum 200 to rotate forward, and then the unloading drum 200 will pull the unloading push plate 300 through the conveyor belt to retreat toward the rear door 100 to unload); during the forward rotation of the drum hydraulic motor 2, the hydraulic oil in the drum hydraulic motor 2 will flow from the drum hydraulic motor 2 to the drum motor reverse rotation interface A2. Port B2, then from the drum motor reversing interface B2 through the one-way sequence valve 4.8 back to the unloading and return electromagnetic reversing valve 4.6, and finally from the return oil port of the unloading and return electromagnetic reversing valve 4.6 through the return oil port T of the hydraulic control integrated block 4 back to the hydraulic oil tank 6; in addition, since the hydraulic winch (not shown in the figure) is connected to the unloading push plate 300 through the winch wire rope (not shown in the figure), in the process of the drum hydraulic motor 2 pulling the unloading push plate 300 backward to unload through the unloading drum 200 and the conveyor belt, the hydraulic winch will also be driven to rotate through the winch wire rope, that is, the winch hydraulic motor 3 will be reversed at this time, and it is shown in the hydraulic principle diagram that the winch hydraulic motor 3 will absorb oil from the winch motor reversing port B3 and discharge oil from the winch motor forward interface A3.

[0079] In the present invention, refer to Figure 6 As shown, when the electromagnetic coil T0 of the main overflow valve electromagnetic reversing valve 4.2, the electromagnetic coil TL of the sub-overflow valve electromagnetic reversing valve 4.4 and the electromagnetic coil T4 of the discharge and return electromagnetic reversing valve 4.6 are energized, it is in the return working state. At this time, the hydraulic oil circuit in the hydraulic control system flows as follows:

[0080] The hydraulic oil in the hydraulic oil tank 6 will first enter the hydraulic oil pump 5 through the filter 8, and then be pumped into the unloading and return electromagnetic reversing valve 4.6 through the hydraulic oil pump 5 through the oil inlet P of the hydraulic control integrated block 4, and then flow from the oil outlet b of the unloading and return electromagnetic reversing valve 4.6 through the winch motor forward interface A3 to the capstan hydraulic motor 3, and then flow into the capstan motor reverse port B3 through the capstan hydraulic motor 3. When the pressure of the winch motor forward interface A3 continues to increase, the capstan wire rope and the conveyor belt are both tightened, and the drum hydraulic motor 2 tends to be driven. At this time, the valve core of the one-way sequence valve 4.8 is opened under the system pressure, and the hydraulic oil flowing out from the oil outlet b of the unloading and return electromagnetic reversing valve 4.6 will flow from the winch motor forward interface A3 and the drum motor reverse interface respectively. B2 flows into the capstan hydraulic motor 3 and the drum hydraulic motor 2. At this time, if the flow of hydraulic oil flowing into the forward interface A3 of the capstan motor is too large, the linear speed of the capstan wire rope at the hydraulic capstan will be greater than the linear speed of the conveyor belt on the unloading drum. At this time, the hydraulic system pressure will increase, and the valve core opening of the one-way sequence valve 4.8 will become larger. When the valve core opening of the one-way sequence valve 4.8 becomes larger, the hydraulic oil flow flowing into the reverse interface B2 of the drum motor will also increase. When the hydraulic oil flow flowing into the reverse interface B2 of the drum motor increases, the linear speed of the capstan wire rope at the hydraulic capstan will be less than the linear speed of the conveyor belt on the unloading drum. At this time, the hydraulic system pressure will decrease again, and the valve core opening of the one-way sequence valve 4.8 will become smaller. In this reciprocating manner, the hydraulic system will reach dynamic balance.

[0081] In the present invention, the opening and closing time of the rear door switch cylinder 1 is preferably 5-10s.

[0082] In the present invention, the drum hydraulic motor 2 is preferably a plunger motor with a maximum system pressure of 30 MPa and a system flow of 150 L / min.

[0083] In the present invention, the winch hydraulic motor 3 is preferably a plunger motor with a maximum system pressure of 16 MPa and a system flow of 40 L / min.

[0084] In the present invention, refer to Figure 1 As shown, the main overflow valve electromagnetic reversing valve 4.2 and the sub-overflow valve electromagnetic reversing valve 4.4 are preferably two-position two-way electromagnetic reversing valves.

[0085] In the present invention, refer to Figure 1 As shown, the rear door electromagnetic reversing valve 4.5 and the discharge and return electromagnetic reversing valve 4.6 are preferably three-position four-way electromagnetic reversing valves.

[0086] In the present invention, refer to Figure 1 As shown, the one-way sequence valve 4.8 is composed of a sequence valve and a one-way valve connected in parallel.

[0087] In the present invention, refer to Figure 1As shown, the two-way throttle valve 4.7 is formed by two one-way throttle valves connected in parallel, and each one-way throttle valve is formed by a throttle valve and a one-way valve connected in parallel.

[0088] As a specific application embodiment of the hydraulic control system for a low-density material transport semitrailer of the present invention: Figure 7 and Figure 8 As shown, there are two rear door switch cylinders 1 and they are symmetrically arranged on the left and right sides of the car body 500 of the low-density material transport semi-trailer, and one end of each rear door switch cylinder 1 is hinged to the rear door 100, and the other end is hinged to the car body; the drum hydraulic motor 2 is arranged at the rear end of the car body 500 of the low-density material transport semi-trailer, and is connected to the unloading drum 200, and the unloading drum 200 is connected to the rear end of the unloading push plate 300 through a conveyor belt, which is used to drive the unloading push plate 300 to retreat to realize the unloading operation; the winch hydraulic motor 3 is arranged at the front end of the car body 400 of the low-density material transport semi-trailer, and is connected to the hydraulic winch 400, and the hydraulic winch 400 is connected to the front end of the unloading push plate 300 through the winch wire rope, which is used to drive the unloading push plate 300 forward to realize the return operation.

[0089] Finally, it should be noted that the above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly used in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A hydraulic control system for a low-density material transport semitrailer, characterized in that: The invention comprises a rear door switch oil cylinder (1) for controlling the opening and closing of a rear door (100) of a low-density material transport semitrailer, a drum hydraulic motor (2) for controlling the rotation of a discharge drum (200) of the low-density material transport semitrailer, a winch hydraulic motor (3) for controlling the return of a discharge push plate (300) of the low-density material transport semitrailer, a hydraulic control integrated block (4) for controlling the movement of the rear door switch oil cylinder (1), the drum hydraulic motor (2) and the winch hydraulic motor (3), and a hydraulic oil pump (5) and a hydraulic oil tank (6) for providing power to the entire hydraulic control system; The rear door switch cylinder (1), the drum hydraulic motor (2), the winch hydraulic motor (3), the hydraulic oil pump (5) and the hydraulic oil tank (6) are all connected to the hydraulic control integrated block (4), and the hydraulic oil pump (5) is also respectively connected to the hydraulic oil tank (6) and the engine power take-off (7) of the low-density material transport semitrailer; The hydraulic control integrated block (4) comprises a main overflow valve (4.1) and a main overflow valve electromagnetic reversing valve (4.2), a sub-overflow valve (4.3) and a sub-overflow valve electromagnetic reversing valve (4.4), a rear door electromagnetic reversing valve (4.5), a discharge and return electromagnetic reversing valve (4.6), a one-way sequence valve (4.8), a two-way throttle valve (4.7), an inlet oil P, an oil return port T, a pressure measuring port P1, a rear door oil cylinder rod extension interface A1, a rear door oil cylinder rod retraction interface B1, a drum motor forward rotation interface A2, a drum motor reverse rotation interface B2, a winch motor forward rotation interface A3 and a winch motor reverse rotation interface B3; The oil inlet (P) is respectively connected to the pressure measuring port (P1), the oil inlet of the main overflow valve (4.1), the oil inlet of the rear door electromagnetic reversing valve (4.5), the oil inlet of the discharge and return electromagnetic reversing valve (4.6), and the oil outlet of the hydraulic oil pump (5); The oil return port (T) is respectively connected to the oil outlet of the main overflow valve (4.1), the oil outlet of the main overflow valve electromagnetic reversing valve (4.2), the oil outlet of the sub-overflow valve (4.3), the oil return port of the rear door electromagnetic reversing valve (4.5), the oil return port of the discharge and return electromagnetic reversing valve (4.6) and the winch motor reversing port B3; The oil inlet of the main overflow valve electromagnetic reversing valve (4.2) is connected to the oil outlet of the main overflow valve (4.1); The oil inlet of the sub-relief valve (4.3) is connected to the oil outlet of the sub-relief valve electromagnetic reversing valve (4.4), the oil inlet of the sub-relief valve electromagnetic reversing valve (4.4) is connected to the hydraulic control oil port of the main relief valve (4.1), and the hydraulic control oil port of the main relief valve (4.1) is also connected to the oil inlet of the main relief valve (4.1); The oil outlet a and the oil outlet b of the rear door electromagnetic reversing valve (4.5) are respectively connected to the two-way throttle valve (4.7), and the two-way throttle valve (4.7) is respectively connected to the rear door oil cylinder rod extension interface A1 and the rear door oil cylinder rod retraction interface B1, and the rear door oil cylinder rod extension interface A1 and the rear door oil cylinder rod retraction interface B1 are respectively connected to the rod extension interface a and the rod retraction interface b of the rear door switch oil cylinder (1); The oil outlet a and the oil outlet b of the discharge and return electromagnetic reversing valve (4.6) are respectively connected to the drum motor forward rotation interface A2 and the one-way sequence valve (4.8), and the one-way sequence valve (4.8) is respectively connected to the drum motor reverse rotation interface B2 and the winch motor forward rotation interface A3; The drum motor forward rotation interface A2 and the drum motor reverse rotation interface B2 are respectively connected to the forward rotation interface a and the reverse rotation interface b of the drum hydraulic motor (2); The winch motor forward rotation interface A3 and the winch motor reverse rotation interface B3 are respectively connected to the forward rotation interface a and the reverse rotation interface b of the winch hydraulic motor (3).

2. The hydraulic control system for a low-density material transport semitrailer according to claim 1, characterized in that: A pressure gauge (9) is also connected to the pressure measuring port P1.

3. The hydraulic control system for a low-density material transport semitrailer according to claim 1, characterized in that: A filter (8) is also connected between the hydraulic oil pump (5) and the hydraulic oil tank (6).

4. The hydraulic control system for a low-density material transport semitrailer according to claim 1, characterized in that: When the electromagnetic coil T0 of the main overflow valve electromagnetic reversing valve (4.2) and the electromagnetic coil TL of the sub-overflow valve electromagnetic reversing valve (4.4) are both not energized, the inlet oil P and the oil return port T of the hydraulic control integrated block (4) are connected.

5. The hydraulic control system for a low-density material transport semitrailer according to claim 1, characterized in that: When the electromagnetic coil T0 of the main overflow valve electromagnetic reversing valve (4.2) is energized and the electromagnetic coil TL of the sub-overflow valve electromagnetic reversing valve (4.4) is not energized, the set pressure of the main overflow valve (4.1) is 30 MPa.

6. The hydraulic control system for a low-density material transport semitrailer according to claim 1, characterized in that: When the electromagnetic coil T0 of the main overflow valve electromagnetic reversing valve (4.2) and the electromagnetic coil TL of the sub-overflow valve electromagnetic reversing valve (4.4) are both energized, the set pressure of the main overflow valve (4.1) is 16 MPa.

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